In a furnace operation, which is not preheated?
(A) Solid fuels
(B) Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)
(C) Both (A) and (B)
(D) Neither (A) nor (B)
(A) Solid fuels
(B) Hydrocarbon containing fuel gases (e.g. coke oven gas, refinery gas etc.)
(C) Both (A) and (B)
(D) Neither (A) nor (B)